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Try to clear the CMOS removing the CMOS battery and all power cables from the power supply to the motherboard, leaving the system without power for 20 minutes at least, then move the BIOS jumper from pins 1 and 2 to pins 2 and 3 and power up the motherboard. If the system boots to the system BIOS load defaults and save changes.
If there is no display at all, try a BIOS recovery with the information on this link:
I already tried that but the solution was to buy replacement motherboard. The clear cmos jumper did'nt work, still no display.